Liquid Discharge Head and Liquid Discharge Apparatus

Abstract

There is provided a liquid discharge head including a channel unit. The channel unit includes: first and second individual channel groups including a plurality of first and second individual channels; two supply manifolds and two return manifolds; and bypass channels communicating with the two supply manifolds or with the two return manifolds. A relationship of |P1|>|P2| is satisfied, wherein P1 is a first pressure of the supply manifold provided commonly for the first individual channel group, P2 is a second pressure of the supply manifold provided commonly for the second individual channel group,−P1 is a third pressure of the return manifold provided commonly for the first individual channel group, and −P2 is a fourth pressure of the return manifold provided commonly for the second individual channel group.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The present application claims priority from Japanese Patent Application No. 2019-127604 filed on Jul. 9, 2019, the disclosure of which is incorporated herein by reference in its entirety.BACKGROUNDField of the Invention:[0002]The present disclosure relates to a liquid discharge head for discharging liquid from a discharge port, and a liquid discharge apparatus including the liquid discharge head.Description of the Related Art:[0003]An ink discharge head for discharging an ink is known as an example of the liquid discharge head for discharging a liquid from a discharge port. As for such a known ink discharge head, there is an ink discharge head including a plurality of individual liquid chambers (individual channels) which are communicated with a plurality of nozzles respectively, a common liquid chamber (supply manifold) which supplies the ink to the plurality of individual liquid chambers, and a circulating common liquid chamber (return ...

AI Technical Summary

Benefits of technology

The liquid discharge head and apparatus described in this patent aim to ensure that the liquid is always flowing through the system. The technical effect of this invention is to provide a more reliable and consistent liquid discharge system.

Problems solved by technology

However, in the case of the configuration in which the liquid contained in the head is circulated via the individual channels, the flow resistance of the individual channel becomes relatively high, and the circulating flow rate of the liquid is decreased.

Therefore, the heat, which is accumulated in the head, cannot be sufficiently dissipated.

It is feared that the temperature of the head may be excessively raised, and the discharge characteristic of the liquid may be varied.

Images